Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN1999GOLF (1J1) L4-2.0L (AEG)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSRECALLSRECALL - ECM SOFTWARE UPDATE/OXYGEN SENSOR REPLACEMENTOVERVIEW
1999 Volkswagen Golf (1J1) L4-2.0L (AEG)
Recall - ECM Software Update/Oxygen Sensor Replacement: Overview
1999 Volkswagen Golf (1J1) L4-2.0L (AEG)SECTION Overview
WA-US
Subject:
1999-2001 Model Volkswagen
Golf/Jetta and New Beetle 2.0 Liter Gasoline Engine Vehicles Reprogramming of Engine Control Module and Replacement of Malfunctioning Oxygen Sensor
December 2001
Work Procedure
This procedure describes re-programming the engine control module (ECM) and, if necessary, replacing the front oxygen sensor. However, some affected vehicles may not require re-programming of the ECM, which will be made apparent during the checking process.
Special Tools and Equipment
- VAS 5051 vehicle diagnostic, testing and information system
- VAS 5051 / 6 diagnostic cable harness
- VAG 1788/10 engine speed adjuster
- 3337 tool
- VAS 6103 serial port cable supplied by VWoA
- CD ROM containing re-programming information (part number 1J0 909 961) supplied by VWoA
Volkswagen of America, Inc.
Owner Letter
Subject:
1999-2001 Model Volkswagen
Golf/Jetta and New Beetle 2.0 Liter Gasoline Engine Vehicles Reprogramming of Engine Control Module and Replacement of Malfunctioning Oxygen Sensor
December 2001
Work Procedure
This procedure describes re-programming the engine control module (ECM) and, if necessary, replacing the front oxygen sensor. However, some affected vehicles may not require re-programming of the ECM, which will be made apparent during the checking process.
Special Tools and Equipment
- VAS 5051 vehicle diagnostic, testing and information system
- VAS 5051 / 6 diagnostic cable harness
- VAG 1788/10 engine speed adjuster
- 3337 tool
- VAS 6103 serial port cable supplied by VWoA
- CD ROM containing re-programming information (part number 1J0 909 961) supplied by VWoA
Volkswagen of America, Inc.
Owner Letter
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.